Factors affecting the magnetic force of Ndfeb magnets.
Ambient temperature, because the sintered NdFeb is extremely sensitive to the working temperature, the instantaneous maximum temperature and continuous maximum temperature of the environment may produce different degrees of demagnetization of the magnet, including reversible and irreversible, recoverable and unrecoverable.
What are the precautions for the storage and transportation of magnets?
The magnet should be kept ventilated and dry in the room when it is stored, otherwise the wet environment will easily cause the magnet to rust. The ambient temperature should not exceed the maximum working temperature of the magnet; Unplated products can be properly oiled to prevent rust when stored; Magnetized products should be stored away from magnetic field sensitive objects such as disks, magnetic cards, tapes, computer monitors and watches. Magnet material is relatively brittle, transportation, plating (coating), installation process, should ensure that the magnet is not subjected to violent impact, if the method is not appropriate, may cause magnetic damage, crack; Magnetized transport should be shielded, especially air transport must be thoroughly shielded.
What are the precautions for the operation of the magnet?
The magnet should ensure that the workplace is clean during use, otherwise it is easy to absorb magnetic particles such as iron filings and affect the use; The NdFeb material is characterized by hard and brittle, and its suction can reach more than 600 times its own weight, which is easy to suck and damage. The operation process should pay attention to avoid bumps and damages for small specifications, and pay more attention to personal safety and protection for large specifications.
How to measure the level of magnetic properties?
There are mainly three parameters: Residual Induction Br (unit Gauss), the remaining magnetic flux density after removing the magnetic field from the saturation state, which represents the strength of the magnetic field that the magnet can provide externally; Coercive Force Hc (Coercive Force), unit Oersteds, is to put the magnet in a reverse applied magnetic field, when the applied magnetic field increases to a certain strength, the magnetic force of the magnet will disappear, the ability to resist the applied magnetic field is called coercive force, representing the measure of anti-demagnetization ability; Magnetic energy product BHmax, unit Gauss-Oersteds, is the magnetic field energy generated per unit volume of material, is a physical quantity of how much energy can be stored by the magnet.
How long can the magnetic properties of NdFeb last?
Ndfeb magnets have a very high coercive force, and there will be no demagnetization and magnetic changes under natural environment and general magnetic field conditions. Assuming the appropriate environment, even after a long time of use, the loss of magnetic energy of the magnet will not be very large. Therefore, in practical applications, we often ignore the influence of time factors on magnetic properties.